8,096 research outputs found
Atom interferometry in the presence of an external test mass
The influence of an external test mass on the phase of the signal of an atom
interferometer is studied theoretically. Using traditional techniques in atom
optics based on the density matrix equations in the Wigner representation, we
are able to extract the various contributions to the phase of the signal
associated with the classical motion of the atoms, the quantum correction to
this motion resulting from atomic recoil that is produced when the atoms
interact with Raman field pulses, and quantum corrections to the atomic motion
that occur in the time between the Raman field pulses. By increasing the
effective wave vector associated with the Raman field pulses using modified
field parameters, we can increase the sensitivity of the signal to the point
where the quantum corrections can be measured. The expressions that are derived
can be evaluated numerically to isolate the contribution to the signal from an
external test mass. The regions of validity of the exact and approximate
expressions are determined.Comment: 23 pages, 3 figures, 2 table
Alien Registration- Frost, Libby S. (Waterville, Kennebec County)
https://digitalmaine.com/alien_docs/15161/thumbnail.jp
Landau equations and asymptotic operation
The pinched/non-pinched classification of intersections of causal
singularities of propagators in Minkowski space is reconsidered in the context
of the theory of asymptotic operation as a first step towards extension of the
latter to non-Euclidean asymptotic regimes. A highly visual
distribution-theoretic technique of singular wave fronts is tailored to the
needs of the theory of Feynman diagrams. Besides a simple derivation of the
usual Landau equations in the case of the conventional singularities, the
technique naturally extends to other types of singularities e.g. due to linear
denominators in non-covariant gauges etc. As another application, the results
of Euclidean asymptotic operation are extended to a class of quasi-Euclidean
asymptotic regimes in Minkowski space.Comment: 15p PS (GSview), IJMP-A (accepted
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Ohmic diode
Process produces linearly responding surface barrier diodes. Hydrogen-fired, conducting strontium titanate crystals provide linear characteristics. The process uses space charge potentials and depletion layer phenomena to achieve conduction and insulation
Bell inequality for pairs of particle-number-superselection-rule restricted states
Proposals for Bell inequality tests on systems restricted by superselection
rules often require operations that are difficult to implement in practice. In
this paper, we derive a new Bell inequality, where pairs of states are used to
by-pass the superselection rule. In particular, we focus on mode entanglement
of an arbitrary number of massive particles and show that our Bell inequality
detects the entanglement in the pair when other inequalities fail. However, as
the number of particles in the system increases, the violation of our Bell
inequality decreases due to the restriction in the measurement space caused by
the superselection rule. This Bell test can be implemented using techniques
that are routinely used in current experiments.Comment: 9 pages, 6 figures; v2 is the published versio
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